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Stock-Based Compensation - Summary of Stock-Based Compensation Activity (Detail) - 2008 Plan, 2015 Plan and 2018 Plan [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Options Outstanding, Shares Available for Grant      
Shares Available for Grant, Beginning balance 1,117,796    
Shares Available for Grant, Awards authorized 945,139    
Shares Available for Grant, Granted (650,460)    
Shares Available for Grant, forfeited/cancelled 108,553    
Shares Available for Grant, Ending balance 1,521,028   1,117,796
Options Outstanding, Number of Shares Outstanding      
Number of Shares Outstanding, Beginning balance 4,146,928    
Number of Shares Outstanding, Options granted 650,460    
Number of Shares Outstanding, Options exercised (21,662) 0  
Number of Shares Outstanding, Options forfeited/cancelled (108,553)    
Number of Shares Outstanding, Ending balance 4,667,173   4,146,928
Number of Shares Outstanding, Exercisable 755,413    
Number of Shares Outstanding, Vested and expected to vest 4,131,935    
Options Outstanding, Weighted-Average Exercise Price Per Share      
Weighted-Average Exercise Price Per Share, Beginning balance $ 19.45    
Weighted-Average Exercise Price Per Share, Options granted 16.52    
Weighted-Average Exercise Price Per Share, Options exercised 13.28    
Weighted-Average Exercise Price Per Share, Options forfeited/cancelled 14.72    
Weighted-Average Exercise Price Per Share, Ending balance 19.18   $ 19.45
Weighted-Average Exercise Price Per Share, Exercisable 46.18    
Weighted-Average Exercise Price Per Share, Vested and expected to vest $ 20.09    
Options Outstanding, Weighted-Average Remaining Contractual Term (Years)      
Weighted-Average Remaining Contractual Term (Years) 8 years 9 months 3 days   8 years 10 months 2 days
Weighted-Average Remaining Contractual Term (Year), Exercisable 5 years 7 months 28 days    
Weighted-Average Remaining Contractual Term (Year), Vested and expected to vest 8 years 8 months 1 day    
Options Outstanding, Aggregate Intrinsic Value of Outstanding Options      
Aggregate Intrinsic Value of Outstanding Options $ 16,794   $ 12,227
Aggregate Intrinsic Value of Outstanding Options, Exercisable 1,905    
Aggregate Intrinsic Value of Outstanding Options, Vested and expected to vest $ 14,075